Paper Mate 1803509 InkJoy 550 RT Retractable Medium Point Advanced Ink Pens, 4 Colored Ink Pens(1803509) The technology of Inkjoy: a unique blend of ultra-low viscosity inks and optimized writing tips gives you crisp, clean lines and unparalleled smoothness. The art of Inkjoy: a range of sleek and modern pen designs houses a rich palette of vivid ink colors to dazzle your writing imagination. InkJoy 550 pens have an hourglass shape sculpted to fit the contours of your hand and a full-length rubberized grip that make them exceptionally comfortable to hold and easy to control. Translucent and opaque materials flow together for a stylish look. The metal clip and accents provide durability. Tip retracts for convenient, one-hand use. 1.0 mm point gives you a nice, solid, smooth line for general writing.